Light source device, lighting circuit of dielectric barrier discharge lamp, lighting method of dielectric barrier discharge lamp

摘要

PROBLEM TO BE SOLVED: To adjust the illuminance of a dielectric barrier discharge lamp when the dielectric barrier discharge lamp is lit by a flyback type lighting circuit. A lighting circuit for lighting a dielectric barrier discharge lamp includes a DC power supply, a primary winding connected to a positive electrode side terminal of the DC power supply, and a secondary side winding connected to the dielectric barrier discharge lamp. It includes a transformer having a wire, a closed circuit in which a DC power supply, a primary winding, and a switching element including a parasitic diode are connected in series, and a control unit that controls ON / OFF of the switching element. The control unit elapses a predetermined OFF holding time from the first step of transitioning the switching element from the ON state to the OFF state and the time when the regenerative current flowing through the primary winding reaches a zero value after the first step. Later, a second step of transitioning the switching element from the OFF state to the ON state is executed. [Selection diagram] Fig. 5